mypy

GH-143732: SEND specialization #20852

Job	Run time
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/build	18s
Run mypy on Tools/jit	20s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/clinic	19s
Run mypy on Tools/check-c-api-docs	27s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/_pyrepl	17s
	3m 0s

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